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There are 3 modes to check servos or ESC: Manual mode: turn the knob with different speed, check the reaction time; Neutral mode: make the servo go back to the neutral point;;Automatic window wiper mode: make the servo swing like a window wipers in the biggest angle.;It can connect 1-3 servos simultaneously and test such as 1-3 servos consistency and so on. You can also connect 1-3 ESC to test and compare their reaction time respectively.;It can connect 3 servos of the CCPM helicopters and select servos. It can also connect the servo of airplanes install the steering-box and adjust planes by using such as the neutral mode and so on.;Package Contents: 1 x Servo Tester